Icosikaienneagonal Number | C # implementation for above approach ; Function to Find the Nth icosikaienneagonal Number ; Driver Code
using System ; class GFG { static int icosikaienneagonalNum ( int n ) { return ( 27 * n * n - 25 * n ) / 2 ; } public static void Main ( ) { int n = 3 ; Console . Write ( icosikaienneagonalNum ( n ) ) ; } }